Properties of efficient accretion events. Top: Turbulent Jeans length over cell size (λ_J, turb/Δx) versus hydrogen number density (n_H) of cells hosting sink particles in SINK-Fid. Note that the sum of gas, stars, sinks, and dark matter particles is used to estimate the total density (ρ) of the host cell when calculating λ_J, turb in Eq. (6). We show sink particles with an accretion rate greater than 10⁻⁵ M_⊙ yr⁻¹ and n_H greater than 100 cm⁻³ from all snapshots. The horizontal dashed line corresponds to λ_J, turb = Δx, below which star formation can be triggered in the GTT runs. Bottom: SFEs per free-fall time, measured directly from the accretion rate and gas mass within the accretion zone (ε_ff, acc), versus that derived from the host cell of the sink particle using Eq. (3) (ε_ff, cell). Data points with ε_ff, cell < 10⁻³ M_⊙ yr⁻¹ are represented by arrows. The black dashed line indicates a one-to-one relationship. The color scale represents Ṁ_acc in both panels.